If you'd gone to buy something else, would you only have decided to quit smoking if that something else had been out of stock? Might've been a possibility, Yessish Would it work if you'd gone to meet someone, who didn't show up? I doubt it.
Is the specific type or brand of tobacco(s) you smoke relevant? it's color? shape? texture? No, I smoke regular cigarettes, I do not have a preference about a type.
Just to make sure, this is smoking tobacco you are referring to, not chewing tobacco or the like? Yes, smoking tobacco. Not relevant, I guess, but don't know any other type.
Do you plan to use a substitute of some kind for using tobacco? NO! And that might be relevant.
Did you not find the tripe because they didn't stock it or had just sold the last of it? Irrel. They normally have it. At that specific moment it was lacking. Is a specific side effect of smoking relevant ? breathlessness? No. Maybe cost of the vice.
HINT: The key to the puzzle is an event that happened after I returned home, not finding tripe. It could have happened after returning home and not finding any other thing, eventually, with a small caveat.